feat: ship manifest.launcher.md for master-detail launcher

manifest.launcher.md

@@ -0,0 +1,23 @@
+---
+{"summary":"Vagrant skeleton — puppet + interaction test chamber","author":"calic","tags":["test-chamber","puppet","interaction"],"teaser_images":[]}
+---
+
+# Vagrant Skeleton
+
+Multi-bone humanoid puppet walking around a tile chamber with interactable furniture.
+
+## What it shows
+
+- 13-bone humanoid puppet (lib-core.puppet)
+- Sprite-tilemap (lib-core.maps)
+- Walk + sprint animation (Shift + WASD)
+- Backpack composition entity with proximity interaction (press E near it)
+- Body + head look-at targets follow the mouse
+
+## Controls
+
+- WASD: move
+- Shift + WASD: sprint
+- Mouse: look-at target
+- E: interact with backpack
+- ESC: quit to launcher